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Don't you need (up to) `N cut depths - 1` keys per pin? E.g. if there are 4 possible cut depths for a pin, and your key has depth 3 on pin 1, you need to (potentially) test depths 1, 2, and 4 -- and if none of them work, your key shares a depth with the master key.



Oh, you could re-use the same test key if you start at the higher depth, of course.




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